I bought this amp for powering 2-two speaker systems in my teardrop camper. One set inside for music and movies, and one outside for music in the galley. Using a speaker selection switch you can isolate the sound to each individual area, or have all 4 speakers on at once. It has powered all 4 speakers without a problem, at volume levels higher than I would normally want to use. Using 3.5mm to RCA adapters and 1:2 RCA splitters it is set up to take input from 3 sources without having to unplug one to plug in another. So far it has only traveled about 500 miles on the road, but no problems so far.